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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

why does it not give the right value (24)
I suppose that the number 23 is somehow stored in the variable lines as string and not as number. Can that be true? How can I convert variable lines in a number?

the lines= wc -l....... part isn't syntactically correct, it should be:

lines="`wc -l nodesAndCoordinates | gawk '{print 23}'`"

Besides that, the above line is strange. The output of the wc -l part is discarded (it is given to gawk, but gawk only prints 23) and 23 is printed. I don't know if the output of the wc -l line is actually needed, if not do something like this: lines="23".